Use lexical-binding in almost all of play/*.el

* lisp/play/5x5.el: Use lexical-binding.
(5x5-draw-grid-end, 5x5-draw-grid, 5x5-solver)
(5x5-solve-suggest): Silence byte-compiler.

* lisp/play/cookie1.el: Use lexical-binding.
(cookie-shuffle-vector, cookie-apropos): Silence byte-compiler.

* lisp/play/zone.el: Use lexical-binding.
(zone): Convert lambda to proper lexical closure.
(zone-replace-char, zone-fill-out-screen): Silence byte-compiler.

* lisp/play/blackbox.el:
* lisp/play/doctor.el:
* lisp/play/gametree.el:
* lisp/play/hanoi.el: Use lexical-binding.

* test/lisp/play/cookie1-resources/cookies:
* test/lisp/play/cookie1-tests.el: New files.

2 files changed, 48 insertions, 0 deletions

diff --git a/test/lisp/play/cookie1-resources/cookies b/test/lisp/play/cookie1-resources/cookies
new file mode 100644
index 00000000000..7bf569fa7d6
--- /dev/null
+++ b/test/lisp/play/cookie1-resources/cookies
@@ -0,0 +1,8 @@
+This fortune intentionally left blank.
+%
+This fortune intentionally not included.
+%
+This fortune intentionally says nothing.
+%
+This fortune is false.
+%
diff --git a/test/lisp/play/cookie1-tests.el b/test/lisp/play/cookie1-tests.el
new file mode 100644
index 00000000000..d63ecb972aa
--- /dev/null
+++ b/test/lisp/play/cookie1-tests.el
@@ -0,0 +1,40 @@
+;;; fortune-tests.el --- Tests for fortune.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2021 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'ert-x)
+(require 'cookie1)
+
+(ert-deftest cookie1-tests-cookie ()
+  (let ((fortune-file (ert-resource-file "cookies")))
+    (should (string-match "\\`This fortune"
+                          (cookie fortune-file)))))
+
+(ert-deftest cookie1-testss-cookie-apropos ()
+  (let ((fortune-file (ert-resource-file "cookies")))
+    (should (string-match "\\`This fortune"
+                          (car (cookie-apropos "false" fortune-file))))
+    (should (= (length (cookie-apropos "false" fortune-file)) 1))))
+
+(provide 'fortune-tests)
+;;; fortune-tests.el ends here